NCR 7156, Owner'S Manual, Page: 45 / 138

7156 Owner’s Guide Chapter 4: Diagnostics
September 1997 39
Checking and Adjusting the MICR Check Reader
The adjustment described in this section cancels or sharply reduces extraneous signals
picked up by the Magnetic Ink Character Recognition (MICR) check reader.
Note: The MICR check reader feature has been factory adjusted for a normal operating
environment with a host computer. However, additional devices, such as CRT monitors or
large metal surfaces near the printer, can affect the printer’s magnetic field, causing
intermittent reading errors when the MICR check reader is in operation.
This condition can be easily diagnosed by checking the MICR check reader adjustment and
readjusting it if the factory setting has been altered. Follow the procedures in this section to
check and adjust the MICR check reader.
Check the MICR Check Reader Adjustment
Caution: Electro Static Discharge may damage the PC board. Wear a grounded wrist strap
and use a static mat or other ESD protected work surface whenever you work with the PC
board.
Note:
The operator panel may differ depending on the model. To put the printer on- or
off-line, use a paper clip or other pointed object to depress the plunger (in place of the On
Line button) on models with that item.
1. Open the front cover.
2. Press the On Line button (or plunger) to put the printer off-line.
Caution:
The DIP switches are pre-set at the factory and should generally not be changed.
If you must change them, do so carefully to avoid changing other functions.
3. Set the DIP switches to the settings in the table.
Switch 8: On = knife, Off = non-knife
Switch 1 Switch
2 Switch
3 Switch
4 Switch
5 Switch
6 Switch
7
On Off Off Off Off Off On
4. Close the front cover.
5. Press the On Line button (or plunger) to put the printer back on-line.